insert gdblib in the middle of symbol package

[laskdjlaskdj12]

Contribution Info I Fix crash when using magic command in Pwngdb.

Reason Reason that i've missed the change package to insert the gdblib in commands/pwngdb. So i insert the package which pwndbg.symbol.address() to pwndbg.gdblib.symbol.address().

Test result It works properly in pwndbg 90dc42e5 commit version.